20745204866247 has 4 divisors (see below), whose sum is σ = 27660273155000. Its totient is φ = 13830136577496.

The previous prime is 20745204866207. The next prime is 20745204866257. The reversal of 20745204866247 is 74266840254702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20745204866247 - 2¹⁶ = 20745204800711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745204866207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3457534144372 + ... + 3457534144377.

It is an arithmetic number, because the mean of its divisors is an integer number (6915068288750).

Almost surely, 2^{20745204866247} is an apocalyptic number.

20745204866247 is a deficient number, since it is larger than the sum of its proper divisors (6915068288753).

20745204866247 is an equidigital number, since it uses as much as digits as its factorization.

20745204866247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6915068288752.

The product of its (nonzero) digits is 36126720, while the sum is 57.

The spelling of 20745204866247 in words is "twenty trillion, seven hundred forty-five billion, two hundred four million, eight hundred sixty-six thousand, two hundred forty-seven".